在轨水生生态研究项目
in-orbit aquatic ecological research project

5月19日，中国科学院专家介绍国内首次在轨水生生态研究项目进展情况，天宫空间站的4条斑马鱼目前状态良好。
Experts from the Chinese Academy of Sciences (CAS) revealed details of the latest developments concerning the country's first in-orbit aquatic ecological research project on May 19. The four zebrafish kept on China's Tiangong space station are currently in good condition.